Packaging box

Abstract

A packaging box includes a box body having a bottom board, side boards, and bending flaps; and a cushioning material having a bottom surface section and side surface sections. A restrainer is formed at least one of the bending flaps, the restrainer having a portion that is separated from and opposes the bottom board when the portion of the restrainer is bent into an accommodation space of the box body. A restrain portion is formed at the side surface section of the cushioning material opposing the restrainer formed at the at least one of the bending flaps, the restrain portion having a portion that is positioned at a side of the bottom board so as to abut upon the portion of the restrainer and that opposes the portion of the restrainer when the cushioning material is fitted in the accommodation space of the box body.

What is claimed is: 
     
       1. A packaging box comprising:
 a box body having a bottom board, a plurality of side boards, and a plurality of bending flaps, the bottom board having a polygonal shape, the side boards standing from respective sides of the bottom board, the bending flaps bending at upper ends of the respective side boards, a space surrounded by the bottom board and the side boards being used as an accommodation space that accommodates a packaging object; and 
 a cushioning material having a bottom surface section and a plurality of cushioning-material side surface sections, the bottom surface section having a polygonal shape which is substantially the same polygonal shape of the bottom board of the box body, the cushioning-material side surface sections standing from respective sides of the bottom surface section, the cushioning material being fitted in the accommodation space of the box body and existing between the box body and the packaging object accommodated in the accommodation space, 
 wherein the bottom surface section of the cushioning material defines an air hole, 
 wherein a restrainer is formed at at least one of the bending flaps of the box body, the restrainer having a portion that is separated from and opposes the bottom board of the box body when the portion of the restrainer is bent into the accommodation space of the box body, and 
 wherein a restrain portion is formed at the cushioning-material side surface section of the cushioning material opposing the restrainer formed at the at least one of the bending flaps, the restrain portion having a portion that is positioned at a side of the bottom board of the box body so as to abut upon the portion of the restrainer and that opposes the portion of the restrainer when the cushioning material is fitted in the accommodation space of the box body. 
 
     
     
       2. The packaging box according to  claim 1 , wherein the restrainer includes an end portion of a bending portion of the bending flap, the bending portion being bent into the accommodation space of the box body, and
 wherein the restrain portion corresponds to a hollow structural portion or a projecting structural portion having the portion that opposes the end portion of the bending flap. 
 
     
     
       3. The packaging box according to  claim 2 , wherein the hollow restrain portion defines a through hole that extends through the cushioning-material side surface section of the cushioning material, a portion of an inner wall of the through hole being formed as the portion that opposes the end portion of the restrainer. 
     
     
       4. The packaging box according to  claim 1 , wherein the cushioning material has a structure that is used with the cushioning-material side surface sections being bent and standing at the respective sides of the bottom surface section, and
 wherein a tilting preventing portion is formed at the cushioning-material side surface section having the restrain portion, another cushioning-material side surface section adjacent to cushioning-material side surface section having the restrain portion, or the bottom surface section, the tilting preventing portion preventing the cushioning-material side surface section having the restrain portion from becoming tilted in a direction in which the cushioning-material side surface section having the restrain portion moves away from the restrainer. 
 
     
     
       5. The packaging box according to  claim 1 , further comprising a cover that covers the air hole. 
     
     
       6. The packaging box according to  claim 5 , wherein the cover is formed at the bottom surface section of the cushioning material, the cover being displaced so as to cover the air hole by being pushed by the packaging object that is being accommodated into the accommodation space of the box body. 
     
     
       7. The packaging box according to  claim 1 , wherein the cushioning material is formed by bending a corrugated cardboard. 
     
     
       8. A packaging box comprising:
 a box body having a bottom board, a plurality of side boards, and a plurality of bending flaps, the bottom board having a polygonal shape, the side boards standing from respective sides of the bottom board, the bending flaps bending at upper ends of the respective side boards, a space surrounded by the bottom board and the side boards being used as an accommodation space that accommodates a packaging object; and 
 a cushioning material having a bottom surface section and a plurality of cushioning-material side surface sections, the bottom surface section having a polygonal shape which is substantially the same polygonal shape of the bottom board of the box body, the cushioning-material side surface sections standing from respective sides of the bottom surface section, the cushioning material being fitted in the accommodation space of the box body and existing between the box body and the packaging object accommodated in the accommodation space, 
 wherein the bottom surface section of the cushioning material defines an air hole, 
 wherein the packaging box further comprises a cover that covers the air hole, and 
 wherein the cover is formed at the bottom surface section of the cushioning material, the cover being displaced so as to cover the air hole by being pushed by the packaging object that is being accommodated into the accommodation space of the box body.